<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>table</title>
    <style>
        th,td{
            border: 1px solid blue;
        }
        table{
            border: 10px solid red;
            border-collapse: collapse;
        }
    </style>
</head>
<body>
    <table border="1" width="700" height="100" cellspacing="0"
     cellpadding="30" align="center">
        <thead><!--加粗-->
            <tr>
                <th>姓名</th>    
                <th>性别</th>    
                <th>性别11</th>    
                <th>年龄</th>    
            </tr>
        </thead>
        <!-- <tr>
            <td>姓名</td>    
            <td>性别</td>    
            <td>年龄</td>    
        </tr> -->
       <tbody>
            <tr>
                <td>张三</td>
                <td rowspan="2">男</td>
                <td>18</td>
            </tr>
            <tr>
                <td>lisi</td>
                <!-- <td>female</td> -->
                <td>10</td>
            </tr>
            <tr>
                <td colspan="2">李四/男</td>
                <td>18</td>
            </tr><!-- shift alt +下箭头快速复制选中区域到下面 -->
            <tr>
                <td colspan="3">李四/男/25</td>
            </tr>
       </tbody>    
    </table>
    <h1><!--ul>li*3快速生成-->
        这是无序列表
    </h1>
    <ul type="circle">
        <li>one</li>
        <li>two</li>
        <li>three</li>
    </ul>

</body>
</html>